Pure Marble Is White and Composed of the Mineral Calcite

Marble Facts

 Marble is a metamorphic stone, which means that it is a rock that changes composition over time from one rock to another.  In marble's case, limestone or dolomite are softened over time under conditions of intense heat and pressure, and then are re-crystallized as marble.  Pure marble is white and composed of the mineral calcite.  It has been very popular for sculpture and building construction because of its beauty and relative softness.  This rock is not banded and do not break into layers. These rocks are said to be unfoliated.

Question: What would you say about the density of this rock? How does it differ from the other types of rock? Slate Facts

 A low grade metamorphosed shale; very fine grained; slaty cleavage should not be confused with bedding planes

 Slate is a fine-grained, foliated metamorphic rock that is created by the alteration of shale or mudstone by metamorphism.

 It is popular for a wide variety of uses such as roofing, flooring and flagging because of its durability and attractive appearance.

 It has been used for blackboards and is the standard material for the beds of pool tables.

Question: Under what conditions do metamorphic rocks form? Describe how metamorphism affects three different kinds of rocks? Quartzite Facts

 Usually metamorphic rock composed of firmly cemented quartz grains.

 Most often it is white, light gray, yellowish, or light brown, but is sometimes colored blue, green, purple, or black by included minerals.

 It results from the metamorphism of pure quartz sandstone.

 Although most quartzites are metamorphic, some are sedimentary in origin, resulting from cementation of quartz sandstone by groundwater solutions containing pure quartz.

 This rock is not banded and do not break into layers. These rocks are said to be unfoliated.

Question: Explain why metamorphism is often associated with intrusive igneous rocks and with plate collisions. Garnet Schist Facts

 A strongly foliated rock with large grains of platy minerals. Named for its minerals.

 Is a medium grade metamorphic rock, formed by the metamorphosis of mudstone/shale, or some types of igneous rock.

 Metamorphism causes impurities in a rock to form minerals such as garnets, which are not found in other types of rocks.

Question: What is the rock cycle? How are rocks changed into different forms in the rock cycle? Gneiss Facts

 Gneiss is a coarse grained granular rock in which foliation results from alternating layers of light and dark minerals

 Rather than an indication of specific mineral comp osition, the term is an indication of texture.

 The "gneissic texture" refers to the segregation of light and dark minerals.

Question: How would a Granite igneous rock turn to metamorphic Gneiss rock?